Audio ToolsPrivate by design
Decibel Ratio Calculator
Convert between decibels and a plain amplitude or power ratio, in either direction.
How to use this tool
- 1Choose the conversion direction.
- 2Choose whether your ratio is an amplitude (voltage) or power ratio.
- 3Enter the known value.
- 4See the converted result.
Frequently asked questions
Why do amplitude and power ratios use different formulas?+
Power is proportional to the square of amplitude, so an amplitude ratio needs a factor of 20 in the dB formula (20·log₁₀) where a power ratio only needs a factor of 10 (10·log₁₀) to give the same dB value for the same underlying change.
Related tools
Keep the boring tools boring.
If this saved you five minutes of nonsense, you can help keep the free tools running.
Buy the toolbox a coffee